Where's my 3DS Metroid game that will force me to
change my pants?

You know the one that looks like Metroid Prime, but is a sidescroller that includes 3D morphball areas, with 2D movement exactly like Metroid Fusion/Super Metroid/Metroid Zero Mission( minus the linearity of Metroid Fusion, but with all the improvements).

When Samus goes on those elevators and the camera changes above her, as she moves away and towards the camera where she's either popping out of the screen going up or moving far away from the screen going down.